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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390f60eb219ac803fd86ed44934f282e5075a9c0e53e66d817e0317b8ba21a38' 
  AND token = 'wXlW99xV7ng8JTCobbWGq3mSCW0RcQ3QkRA02QO0LWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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