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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b5dc5b7b86c5520e3607e889aaf3046f3134bd20920564a9f22df0125aee95' 
  AND token = '3I6A8aPLmGe4BiNr9bfAoFaRplZ2PEhXy+1tOFjr0Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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