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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118bfce338a7c33cc1cd8bc2f79ff57764e59216f59b2121560dcdba2a713b14' 
  AND token = '74JwOD7mGmAw5RG4CpFnsB/XbJw/e76VfOsDapXe2Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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