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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb5d798d4704a95041eddebe2360a90430f14d2f58293b3f411d73a89fb220' 
  AND token = 'Cy8Kwcwjr1cUt+5RWC3dlTFTdU/avsvMdcJEieOj0l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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