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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7b2e07b7e5a29ed1efcb117182ecc413ce3da871cc7ef9adc01f2f17915d5a' 
  AND token = 'nOkLc5EMG69rSYYwfcaHZXkta4GHXLUIxRoFz91oIKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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