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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9eeaa60a28cadacf69680eeedf9a22728cb485c52b621f3147c3ca38a847bc' 
  AND token = 'xhL99739XT3h07nHHYBDIZm4BB6n/YIvdPC1a+0t/Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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