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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc6c93b254a228af41de5fb955e2862759216974d9cad24fbe0c2d820a2f802' 
  AND token = 'b4pG/kLnE1CmC+wTqG0z/ylJSJe6FYy787KHBQAHaSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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