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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d5842a137d6f2df5729f744bda48da61792b04bc080968ee366ae7955feb5a' 
  AND token = 'qGYXjfd1onJjClhnQAONKaEW8IlVfefw5kjecadxB9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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