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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dda8b117ab81e9f55988db2db9d3b9a70144106b981a174e862794d073bacb' 
  AND token = '4dMOsMxWlkDCYP7aPsl1UeSCfMcXL5GHOB0ALg83RT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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