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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a2bbba3947b5ed33b88818eb9ce16fe5a6db3a82689e5f0cbf0ee153b3b2d5' 
  AND token = 'CCUn1dMj4jUmWG6q5eSNPmlCW3mafIrTjZop4pvZBK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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