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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e103171c9b247e7c258b39f87eaaa56840651e3acd9cc80b4099cc35529890f4' 
  AND token = '8iN5+AMTWkE8zxy60KHiEicIRlbHB2/J1lWUYXvMGmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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