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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc0a46ba3f8ade6452d8f3db61ce2f08f673db71d3142644a73d29965d02f3d' 
  AND token = 'E/mkxh5U02gY6F8JzGtUTYCm3SidoodoaJlTLg0viJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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