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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b10616463953615408ced79836f5ff93baf4bc1ff4651eaab241680390d544' 
  AND token = 'Eh9k8a07AnXQCgiO8AWjJMVhjlyLM948AiDKUm0Ko9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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