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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3b4ba33f86ea1747595c7841ac20512876ea06d4da47a38c32e78638c265e9' 
  AND token = '0Bz/VY91KUK6WRyX8HN/Npt5dcp6lm74P0XX7+rdWXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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