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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e047017d3e4de96f0a83c08fbbceae89ab86a31912a9816139778bad52abad' 
  AND token = '5v+BEuGo+Fhlk8IId81xFeMamrCu5uT/e2m+AxtXBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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