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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f719bd450a9ce5e05fff80b1ee5fe0808e4b76062224182058ec9b9dc9a02daa' 
  AND token = 'XX+uP9yoSYqljNWPWD4fc5V1Dul5C2swgqgK27i42Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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