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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5138a159eb385db4e4cf3ce4e48a6b0696ab9b3632e6c7516f7bdec8f1690b24' 
  AND token = 'CgbBPHO3z8WqipL07cFUVEIuZdvaMGeBpM6olDf1G1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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