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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496fd2607e0c0e96e0541957424bcbba3cdaf7b00e488cb2ad7e3cd262fa679b' 
  AND token = 'V560cnfEISMqbCfvB0DV6vYLJ5qKowRSn0M3oW7389k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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