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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aabfdfbc9965f1dc5a56adc0460b0d85125474bf71cfc96424bb2be7dd2d615' 
  AND token = 'vMp99lRTs8olGYYNdeaDzCZ5npBnPb80kjWLbG5Vf0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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