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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f019208b4e3e80e86a5b551d0cb51a422d195a3fb96805b598904afd5220aa2' 
  AND token = 'HJnk6JZBdeYFRCe9yd0KPp2+J9T1yOe0zF2Ic8FD2MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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