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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6f340a2155ae1472ea6a7c87f1469d73c9bb16f092b6c9ac5cfde04fe2bd7f' 
  AND token = 'gG5wXKEOwbnbkg2Nw92zV4HwBORTOlnOoCq1DVNTMXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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