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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ded8f5e1903b6adab29897d2ebd025e99ce20a9f652c98208765f288457024' 
  AND token = '4T5dg7T2OtuPdwCptRJqmujLbfYdzpf4sthVURCUDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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