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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e31b23c0ed459b8ce254010be73a768b0cf3d931e7845cbb227631ba71c73' 
  AND token = 'd+6Sihl0CrYxDsMqmghEqtnDahS/itA5y3uail7jK9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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