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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c7ebbfbf78d35e349d9a4fa3877d4a9e4152824ef926974459e8ee4f1733d5' 
  AND token = 'R+4w3UIT7UyGQbAH5AT6gqqsV1D3wqWkSIX8E1reMkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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