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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd55a9827af58984373a6df5a468f3ad44f9d3c61f56888be55e5526ba7f2ee4' 
  AND token = 'PC4fA9965m0NMmvwvYxQdq4cu/vRx3wqYN+JCTwADjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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