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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e297aa0eb8997d50819b9f7c63850f8e18508920a423e0edfbec48b58ae36337' 
  AND token = '+njugMyf43GZBeqY3bUtQvcYkLu5C6L2aIgqumR0gtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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