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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b664eca5ad5b62165ecfc99473dd1426588ef48623d85c404c771a2dd47187c' 
  AND token = 'DuwokRtrNzc7e52d2AO+oCkCFRPSD0Tm05M7X1gttVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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