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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead5a5674d774abc2003c2455108b79aa8f3d3d4552ee8fedeb5b3a6f08901c6' 
  AND token = 'ZQ7lwjzfp9norXz5K8GyFuPytVxdN7ApHM/QTEkBeYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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