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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6da97d8d7d696506601b2955cf71b7653729b2b01687be070a790e0946c58e' 
  AND token = 'c7EGyNh8TeVl7jsGB7lNm1GdI6HjplqImY7WTTI0qfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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