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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592aa29451e03eb84b503d7647a24d1b1e51900bbedc1e0259120f6b15ef44f1' 
  AND token = 'xNIva7NYdWC5kk0VeaJlmwRh1Bjuz2k+ir4s3q7Lye0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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