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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9a0dc615354d4b1206b84532ddbc3707d4454f57f344efdb0af80f74e8d426' 
  AND token = 'bTXaNyiUiE585O9FfFrG6CwOopMtpYqxNjbmFTTPRTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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