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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44178c64c4a0181de04b5201bc471ac6bce3291bd281eb95585cf64c54d3e71' 
  AND token = 'dPPfBZS/CzppA1f4ufS001XMqoy8KA4bgipiNfrRnk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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