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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f524255cf965fcf160e474eb162517d539e0fa1434bffdfab0b6a195b1cbe865' 
  AND token = 'taBnlQafMeuiesCbx65wpKwTszN/gfATR2Ezws8Ye6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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