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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb69094789efe57a9883d70a455683e10383e1a28be8fe147dd1238d3ec7a5c' 
  AND token = 'n66mV1y52kvFPTSRA2miRM77vXOSWGiLtR6Ztfro0N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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