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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c5977eb06f6594f0b7cc6287c71a1921e1150a0a1e67e00ec19ad96ef30ae8' 
  AND token = 'HaYRzJXYfSfqEq6OaeNrxoleyDMKDswoBNR84c8A9Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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