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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8adc832dc1767d62c3df83426ff59f5c2fabb8c22bece60cc68033b83c2a66e' 
  AND token = 'EA6OxOG1Zw8vFo2zmkuuO0DoekA4IfHohWOouOi6c9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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