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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd385c589f623ca3b8912f32ab865c53835bf04b960868b6007d6d5ebcad1af' 
  AND token = '6FNiHi6E31QYaTiUjL+kwaWHbgi62Vo0Ez2N417REPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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