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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89236fe97a259ca166340f14685cee80844aecb6637dc559ffdc7ebe2ae1c2ce' 
  AND token = 'bY50/FlJXHgcztoF7AnOIiH5qP2cWMldforFkI3+DPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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