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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52705ff99541ba2106672c11a74ac81477556b4ebea6f6e3a30c5a380a57093' 
  AND token = 'Wy67NLdPFE7NfHojCAhnfBgEdALZLCuNzeD5MehRsPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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