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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cd0de19ee08ad52c9c2fc4caab59019f637ce59f08978ae8d5bcbd1decbe4f' 
  AND token = 'Wo/2jHBPVhDNKdSlGdJwe3Wd+kZrdECNz1LeCkYTkNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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