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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb102e74b517af8cef4e937d39aa67a9933aca338755d1aa44c15bffede0edb' 
  AND token = 'jFX9Nl/bMI/y+IsSgvZDlxl6qGPMHIjj7V9rN1J4w40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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