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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbc96d7f68340f9a326af81718b5225105f5a058eaf67705dfe8a18c81934de' 
  AND token = 'PexS9fytNEII9OVaPJvwf9qD/5WDdfGTdB9gGIV0m1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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