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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1da7e8736d6997efa54f4ea4acc7a51db753123b6956150aad8c8ac5e99363' 
  AND token = 'i2gt6dmC55o1F4lTV31Wf1EgsKCi0SIoZx6xPX5WRYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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