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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ea16e770c4b8fba6839f8556de1b31be200f1eaee8a1aff978c9545e4271bd' 
  AND token = 'Qr/qz/Y48rTELfgXSx7p643xP6ySkoFwHzQgVefEU1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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