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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b42ec11e306db103564ff44429d31c19136c26ded939896f2f156a922b84805' 
  AND token = 'KCpCr5xYW5g8OfWVulkp/BW8WXKdxWVI2Mp2lkLLzhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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