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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f5374089bf816025493fe4d9ca48c0035f4d6783461d9e9dcce59e88b6d09b' 
  AND token = '56cn5r+3QRPUpicDXzc/p+ceLY/evTn6KBj6J0H2sKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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