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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767653932aad2f78caf2ff77d5f7416d52e10b866870659c4ce410494cf3cd2c' 
  AND token = 'DzBGWxtX08l2xU9y1pFKiom7CrcluXtaQssENDb2aKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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