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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28ddb0246e59afc021e73779a61b2905d3c1dd0fe2c90a31d6c26166c05cf00' 
  AND token = '4gCP+1efkT85jBGuQsqrJuNkNrEUnlnx4fgQNutd2NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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