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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb885d283f38dea8d371bf6cd0ed76e8aaed2e59b99ed7a1855fe1f7669d9688' 
  AND token = 'NRqlH6FtzL9eUJXA35/X5k/x5Mi3UGaJlalnonEcVhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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