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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bf65de8eb0ba0cbc90fb48df1615f9c77266109c2ace352f5ed5280d41241d' 
  AND token = '41c4BZaQMsGeiv+CAdIB03WAlxb/i52noM6P7bW+014=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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