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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572a7099f05de4844cf21e52c75184b0ed9a6d9214bd43df7a1f91a05b4ad455' 
  AND token = '7GjGtbDqvWmiG3ae7h036qejA8nrrDEy3Kz2hhHjH4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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