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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be27dd8d8462a300722f179f09d00a72f2ae9b1906d06d6090c9b4c4bf51543d' 
  AND token = 'rTIALdZ1vqxTlCHFGVJbhqTlvZzASnkyGQa+Cp5HnA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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