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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b96f973ad6d8aa5e4fbdc3f1a06b6b8a2df2466a3a781e17afb3ab2f0811cd7' 
  AND token = '0F3w2e/Ucyzzl7X4xwH7JZAVO2cZS36pKzpAF+tD8RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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