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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09a23d3e0765368e37b9233e2326760821685c305c50944486b5c5e3750dc12' 
  AND token = 'etHLFEB6eOmEnOYM1eRbIJTPXx08GS1I0tJ6Y+qENUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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