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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3916a374de77e7bbd44ad620f84400a9747cfc18283c296de11aa39453d97d73' 
  AND token = 'mGSS1PUt0c8o0si9g0AQ691kEQv8GnMxDwzp0vnTdJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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