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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64e4112cb85ab898736561abb234d47ec5e9af963b0259327e8ce5cf9cd0b56' 
  AND token = 'qdpx2PIINm/uo4OH6qyUuJiAGbiC5NNFquokiMDa23U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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