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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbfa85567323134563c2e61bee8f05d5ad6faa9e9950fdd1d0ee6af80129d3b' 
  AND token = 'EkR+GzR10Xu7dZ8681NyLiaWGpn4JDbSeC77iz6i8SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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