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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b61065fe4d8e63253c4366f4b57099cbd392f806cda803d17a5a2c2ddd09708' 
  AND token = 'Ph7Hqv94XVXROdlP9+RvTWYnzO5bokMS5hPs+fluBO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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