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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f5dae1c0468ad6280a2ff5d2d9f7b6f09794eaaae2af1afa49be88b54a0cd8' 
  AND token = 'ERJtg8VKRW2X2Xf1aKwjJxpijZ7HatIfRy4vLn1gdJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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