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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a224ce17c712fbd417e197737e165c8f2651bc2f5f1fd9992a293d4f40a6f1' 
  AND token = '7x8a/piDfcwN/0pcZNhnE7t8C3/nYI69gxT4YSzVA0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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