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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7444caa028c083a5c66093dcc18bb73bfb46f3dbd4bf243c4c8f8e859855a91f' 
  AND token = 'RpNTFzlVoVynli+J63ZnjyYdcA3L73GSJ4Y06YWi1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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