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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c3dff0e2d6bae6040069828ba3b9048e0fba608fc26c3549d9d9721b55aaac' 
  AND token = 'uOAWvAO5ACkS+cxCFAumccarkpCroLyq/QaNRll/hkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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