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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de4e4699049c776a4236385b884096a5f7a4fc3a347df2e1d0c4a5ccea93ce7' 
  AND token = 'yxV+IL7F6kS2iq2OGFE4nn+tfjQBIL3SgRTH6lH1t/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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