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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d590fa71b3adea0e78fd7c9c72706bf6dea84833ee38b53d2a6f71f1a0d3fc' 
  AND token = 'tV/d5geJvGfprQZ29GKl6AwdwML7amwJVXoT5kaB61w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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