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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ca2d7c2ca7050bc4a2c5d59f314fa34a06f6835d4fae6968e6e4791209408d' 
  AND token = '5vvn4oxtIc0t30YstFztkmw5pyh5L80GcQPjYIJOw/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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