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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841cc07ff5cfb42574913c94e1d7fa12cd2cc863956eae14aaec5498c7f9f195' 
  AND token = 'jt2P0Lxoq7Bsj/YXJUTkKNfvOBaMcffHmqxqDEwk1rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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