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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a891e782a18c3730cc1283cc12f7c7d8f77662be284470a49d4d470f42f52faa' 
  AND token = 'n5nEzgKya5F3HJ8/6C9JpYxMYZfM0f4pIM/7s6sFu4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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