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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154afb595aae820ffe244c900b0c69c053912992038fb9f486b356c532bc81d1' 
  AND token = 'iwFuCgTifXpSEzSER/aj+57CTQ22DH631yTcx/qfp30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}